# Equilateral triangle

Equilateral triangle
TeepRegular polygon
Edges an vertices3
Schläfli seembol{3}
Coxeter diagram
Symmetry groupD3
Aurie${\displaystyle {\tfrac {\sqrt {3}}{4}}a^{2}}$
Internal angle (degrees)60°

In geometry, an equilateral triangle is a triangle in which aw three sides are equal. In tradeetional or Euclidean geometry, equilateral triangles are an aa equiangular; that is, aw three internal angles are an aa congruent tae each ither an are each 60°. Thay are regular polygons, an can tharefore an a be referred tae as regular triangles.